Heterotrophic activity of bacterioplankton along the gradients of the chlorophyll a concentration and water temperature in marine and limnetic ecosystems

The dependence of the heterotrophic activity of bacterioplankton ( V , μg C L –1 h –1 ) on the concentration of chlorophyll a (Chl, μg L –1 ) and the water temperature ( T ) was examined for lakes (37°29′–80°36′ N) and marine polar waters (69°16′–80°36′ N). It was shown that ~76% of the V variations was related to changes in Chl and T .